For $350, I doubt they were ported and/or polished. However, I would like to know if these have a single-angle valve job, or a 3, 4, or even 5-angle job done on them?

i have a neighbor that works at a nissan machine shop and he ports his own heads and heads for his car buddies in his spare time. some people might have access to some cheap heads and rework them themselves on the side. i was just curious what was done to them... you never know till you ask